Left and right keys or tap. Or press space. Tech for "The New Empires RP".
I tried to keep things realistically costly. Unfortunately, a lot of things are really costly, so I might have to boot up their costs... We should also probably redesign taxes to make it more realistic. I suggest creating a stat to keep track of average amount of money a citizen pays and average house costs and use that plus player-set sales tax and house tax to find out tax income, plus pre-existing income tax.